Hi Jules
Just read this after I had posted on your other thread. I have had experience of elderly folk hallucinating when they have infections. The thing is, it is no good challenging the things they say, asvtonthem they are real! I remember one parishioner who was seeing green chickens under the bed opposite and was quite annoyed that his wife couldn't see them!! All you can be is a calm reassuring presence and surround your Mum with a bubble of love.
God bless all of you in these hard days.
Love Mavis xxx